Someone

    switch (dsp_ip->dsp_datasrc) {
        case RT_DSP_SRC_V4_FILE:
        case RT_DSP_SRC_FILE: {
            if (BU_CK_MAPPED_FILE(dsp_ip->dsp_mp) == NULL) {
            bu_log("BU_CK_MAPPED_FILE failed file %s line %d\n",__FILE__,__LINE
            return 0;
            }
            if (! dsp_ip->dsp_mp ) {
                bu_log("cannot find data for DSP\n");
                return 0;
            }
            }